To get a 4c-5c drop you'd need to switch from the worst TIM to the best TIM, meaning some crappy 50cent TIM to the liquid metal tims. The Corsair uses Shin Etsu which is pretty decent stuff. I wouldn't bother upgrading the TIM ATM, maybe in the future. The Liquid Metal tims are VERY electrically conductive, if you get it in the CPUs pins it will fry, if you ceramic TIM in the pins then you have better heat transfer between the pins and the plastic socket, which is pretty pointless but that's all it will do. XD I accidentally got a pretty good drop of ceramic tim in my AMD socket, which the pins are on the CPU so it was pretty impossible to get out of the mobo socket. Didn't matter because I had ceramic paste, but if I had liquid metal tim I'd be in for a bad day.
Liquid metal TIM isn't permanent per say, you just need a special solvent to remove it after it's cured. Anyways generally people only insist on liquid metal TIM if you're using it for delidding, meaning between the CPU die and the IHS. If you want to squeeze every bit of performance out of your setup go ahead and use it, just be aware of the risks.